Handling Event Delegation in React to Prevent Memory Leaks with Dynamic Components
I'm reviewing some code and Does anyone know how to I'm sure I'm missing something obvious here, but I'm working on a React application where I have a list of items rendered dynamically, and each item has a delete button. I implemented event delegation to handle delete actions more efficiently. However, I noticed that after multiple additions and deletions, the memory usage keeps increasing, and sometimes I encounter a warning about potential memory leaks due to unmounted components. My setup looks like this: ```javascript import React, { useEffect, useRef } from 'react'; const ItemList = ({ items, onDelete }) => { const listRef = useRef(null); useEffect(() => { const handleDelete = (event) => { const target = event.target; if (target && target.matches('.delete-btn')) { const id = target.getAttribute('data-id'); onDelete(id); } }; const list = listRef.current; list.addEventListener('click', handleDelete); return () => { list.removeEventListener('click', handleDelete); }; }, [onDelete]); return ( <ul ref={listRef}> {items.map(item => ( <li key={item.id}> {item.name} <button className='delete-btn' data-id={item.id}>Delete</button> </li> ))} </ul> ); }; ``` The issue seems to occur after several updates to the `items` array which leads to stale closures being retained. I've tried various approaches to control the cleanup process, but the memory consumption does not seem to improve. Also, I’ve checked the `onDelete` prop to ensure it’s not causing the closure to persist incorrectly. Can anyone suggest a better way to handle this scenario to avoid memory leaks while keeping the event delegation intact? Is there a recommended pattern for integrating event delegation in a React context without losing the benefits of functional components? For context: I'm using Javascript on Debian. Any examples would be super helpful. Could this be a known issue? The project is a microservice built with Javascript. What am I doing wrong?